1: 82 percent / 4-(dimethylamino)pyridine, N,N-dicyclohexylcarbodiimide / CH2Cl2 / Ambient temperature 2: 1.) LDA, HMPA / 1.) THF, -78 deg C, 40 min, 2.) THF, reflux, overnight View Scheme

1: 40 percent / LiAlH4 / diethyl ether / 1 h / Ambient temperature 2: 82 percent / 4-(dimethylamino)pyridine, N,N-dicyclohexylcarbodiimide / CH2Cl2 / Ambient temperature 3: 1.) LDA, HMPA / 1.) THF, -78 deg C, 40 min, 2.) THF, reflux, overnight View Scheme

N,N,N',N',N'',N''-hexamethylphosphoric triamide; lithium diisopropyl amide 1.) THF, -78 deg C, 40 min, 2.) THF, reflux, overnight; Yield given. Multistep reaction;